650811121 has 9 divisors (see below), whose sum is σ = 660099531. Its totient is φ = 641652672.

The previous prime is 650811113. The next prime is 650811131. The reversal of 650811121 is 121118056.

It is a happy number.

The square root of 650811121 is 25511.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 292239025 + 358572096 = 17095^2 + 18936^2 .

It is not a de Polignac number, because 650811121 - 2³ = 650811113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650811131) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2474436 + ... + 2474698.

Almost surely, 2^650811121 is an apocalyptic number.

650811121 is the 25511-st square number.

650811121 is the 12756-th centered octagonal number.

It is an amenable number.

650811121 is a deficient number, since it is larger than the sum of its proper divisors (9288410).

650811121 is an frugal number, since it uses more digits than its factorization.

650811121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 25.

The cubic root of 650811121 is about 866.5992759401.

Multiplying 650811121 by its sum of digits (25), we get a square (16270278025 = 127555²).

Adding to 650811121 its reverse (121118056), we get a palindrome (771929177).

The spelling of 650811121 in words is "six hundred fifty million, eight hundred eleven thousand, one hundred twenty-one".